/Engine/Source/Runtime/Engine/Public/AnimationUtils.h
Checks a set of key times to see if the spacing is uniform or non-uniform. Note: If there are as many times as frames, they are automatically assumed to be uniformly spaced. Note: If there are two or fewer times, they are automatically assumed to be uniformly spaced.
true if the keys are uniformly spaced (or one of the trivial conditions is detected). false if any key spacing is greater than 1e-4 off.
static bool HasUniformKeySpacing ( int32 NumFrames, const [TArray](API\Runtime\Core\Containers\TArray)< float > & Times )